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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37e51fa46855daf333f400cc2f128f277eebfdd8eae10fb9a1783fbd78ae7a12' 
  AND token = 'RP9aJxx+MidsECfKlH4q2jQ14WZJQTs5DNMjVtN+eX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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