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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f723ced93b59f85436837cf061ddc0eb98b0741a185173f5d72ee238a96f5e4' 
  AND token = 'fTevX1AMaztSVCRsTwfSih30bSr7Ta7FfQCldTmQg7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00096

JSON explain

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