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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94e7f9acbfd5a5a5dd429e0eeba31c0f29eda6cd32070badc0c44cdbc498f7aa' 
  AND token = 'zb5NWpY7bFBAS2+k1qYDxle8L4Vr0tqCJknPQ5Wgk9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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