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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68bd658dce9f81f27309f22c794a50999137fe2fd294a76c0108e0d27477459a' 
  AND token = 'Z1n9DTroT1W6+L+tcp5Hkcs8tK8Gwvi0DP5/ocN3/jE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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