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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2928ebf6653f60b56faa2c229d45af0ca51d8346f3c020d977c05bb554c2e37' 
  AND token = '/3tB7DIqRtqTCCPkazl/rbfKd58Nz6hu9aZq79RfYXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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