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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38d3c9ddda01da7c48bc2d53e7ceceb9da2a80f57316d342139fec2d67ce8f82' 
  AND token = 'QoHtQT4xn90IlS5qJMJ56GY+JluWaBzh+nuThh14uF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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