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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb1e6f8f959a63edbf8793394c7c8352582e9775ab693b20621eb14f98335dd6' 
  AND token = '4JXK+Oy79OEztUVDMXW0EMm/ggZyp6l2PoEFgVI6exo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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