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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73c4c5ae5f94d5d8bfe3eba164bbc24a20ca9aeba1626732b16e7fbe936f9135' 
  AND token = 's2H0ix/KnGmbnizmydE99zvqigXFv3opTSHyNinGYH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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