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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f50da5b205eb15fca211acacab90e167637a3bd84b2a8d0d869de0de0ea33b0b' 
  AND token = 'lt1cl+3meoko41Tc1I4zwY0wCuPWQ1IE1Zp9BOlyYas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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