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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a34bae7118a2cd723a65e9d97cad63f6787e0fcca3d4c382a3d16aa252e41d11' 
  AND token = 'MZnFZwvqIEL4LKASf/50PgCsCVM41HtUaTzXA4HmrIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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