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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d0d99f09f2f7c1906639d15ac7f2c8d83c0ff59d5feba2a0e73ef805b57ea95' 
  AND token = 'toDRml28aXUfyeVKy0SLmhtc3NUoye0WZccUX7mqMZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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