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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fba34bcffa01c0265858c3b962b33cfc8a39f3e0070b9494317066b71dcf04b' 
  AND token = 'RJx1tQWGrENFTW6F6EQ0p8IRfIfOMn/vKS0OrzR9Hc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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