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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac004d533f6a50be2555182bc179b0e4dcbb52156c2c2a74cc0be7c3f5dc9563' 
  AND token = 'SUm/y2mG09xedlz5Zzdiu614uL3m+oC9UCvRXafOwOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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