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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce494266d6e9fc33a269123268783205c19f70c2c21180ae739957b67e0487e6' 
  AND token = '5u692nc4JOQa9N1wfFJrnDOG5yyMAf163s0Ymr5w/Kc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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