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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9932237ab556035c4ad4d321f1bde05f1e6b1d14b78677bc7168ba1a146503a' 
  AND token = '9KWQKkpswkaq/5Gus1/u9CjfSazju2s6dvkqFgvecYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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