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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34547ea9cd8f00283cb0830adc106d628f2943aafdbcc019d1faf438f6d6dd34' 
  AND token = 'wplYCAjcZxMU95rQ13cj7H9Zzl0LY98ks0lYrz3Wxyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}