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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b08b0d9ab7fd9a3c707c016cbf209b05e1d0995464e85d7f4e389542e3bc0b3' 
  AND token = '0usEjXJtUnfWDQOCN8oHWwe4ONUSXeo/dGlxrTAC8e4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00100

JSON explain

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