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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '102ff3deee25fa20ad00e5da1905b37b6bb0031536d33884f5c73e12cc6b782f' 
  AND token = '8y63+p6NWORbwLdtMWIC+/3SAinTgJ6EwFVHftKvWPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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