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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c6c1309c5161bac2028f3bdf15d4d459ad2286bd05e2623c5f5fc20a915d812' 
  AND token = 'zBBVFEJIlibxcABSkm2L2SLPdlHp8XQeygyBJLdsiNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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