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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0ab4af6d1bc68b211e6ed5dffe67c3d7a513fb73de9582f538566d1aff64ff8' 
  AND token = 'MmoyhySmu1lapF/SYgaRXXyslgUrDyD7uNySuQy/rHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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