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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26dca3dfdc3010501ff8ba2357cb46764c403c7f90760a341f6d4d7a7301df03' 
  AND token = 'lI5ArD3UTL9Jasp12mAMA/LJzhtdGuI36eK5i5nMzzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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