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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01efea0ff052867a98ecb6adefa23ace938828fba9d416c3f9e3ba5f782c6a59' 
  AND token = 'YDnc9SGaFsAOMvq2H9B1azJvLrqinfI2+vBJQzEllvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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