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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dedf544039ec8a8bd62ddc952acbec4599e89be68a60943a94a6a5b81a71ecc3' 
  AND token = '+EphWI1K6d2/Q+d6mHuWvPG2cqsgH781C0jYkF/v/mM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00075

JSON explain

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