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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa7939f32db55a6a006454c8355420bb22c4d6ac29878b85af6431550c81530a' 
  AND token = 'tmRZvb4H+aYr0gHfh9DFiEIM4vm25FyZJSmTGLG4FYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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