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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94b75ecda831aed4bbba090ca978f20dc2c22c8f781911475c33a4731537ea63' 
  AND token = '70A+4+PVCvM3Bf5/hZEtZvmvL/EXXbTIAUT4i7SEMHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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