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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a60bf5a59471003568277f19b1bf4608dcdc2fbd63a188c12509c5e533f82586' 
  AND token = '1e59qcXD8A1DgqdybcLdzyVpnCVifOZVUn3Xpoj6LRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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