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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf7b689b57d8ae2e6ebd806bcd7d0f3d7d86b208d3298efbc953fb0325148180' 
  AND token = '1+GIxb8DbNGFiXD64LVoUTaBir2fPis4Oo8/Za4nnE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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