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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da900b4f6800c8db2004dc542fc3f4f1fdebcfc55b4587d5db70b85dc75bdc53' 
  AND token = 'PmmrQ8HEABLAVNGMynFK3q6EX4p5btD04fL7s2DHFKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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