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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a57a4c2e10d0b5c3ee8215694eb3010d26a4c3f3adfc06d3836c3c9aec7ccfc' 
  AND token = 'ixrX+nfyQexf2ndZQUp0VbHatF21T6IDqBzwuqW84Wc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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