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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94706ab7cf0042932d3c3cce3594331755cb7ed2150cd4c6a44ddecdab2b4d8b' 
  AND token = '+m+bKOncF9cdaOphB79/df6YEjQVmH13/xN3Zr4ULRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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