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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56c8bd25b4741c136e90ce36b63a0655ae3172e2a897666fcb73acbd73e85493' 
  AND token = 'nMebzuYgpkr79T0rCvmgBddsN0Gn+sL/SLsiapu7VSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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