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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fe8cce2689738e5ba3c5932b2400931bfb88da93588ac7ac79ada38db16f97a' 
  AND token = 'B7HxzsKgR6SLEXE73i2l/r79E3SUETsPF6iQNBErTm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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