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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '780cf2630a6577d4659ed105cf57cb63a32d4dc8689243d92ff8c6e31dde3e3d' 
  AND token = 'dJnoJ0r36bPw+lNpGpKmSE+Un0LUqbRThsoTI2dCF84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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