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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e75a6ecf26d42a7af756cbf793df6145d6ad813418ace15058839a9dbaccb74c' 
  AND token = 'nfs0/i7RqbBAxx50Pdy4M/jQETp+UIgRsvJbaFzIQ6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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