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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e12e415e0af0438ed68928b28235dc4d1325418f43b0ab1b1d6db893ff186b9' 
  AND token = 'nvBSglg5tiODXufC4Ml9nTTY7R+XLb3uAUbRy+fPPBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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