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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c698797ba5a34ef3be35314b63001068fa0b27ac51738b7fa6b281e79303816a' 
  AND token = 'cR9tQvJ68hSWEjt1p1Vn+O/w0gh02B8PqVNtGLAcgnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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