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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95bacd6690967ba698eb6cb8895554a4b4a9f64748154f3cbe41d0c6d75190e2' 
  AND token = 'uzym7dG9do8/NyzfxVMx4DaJdVRmymbzIAyjKY+MBzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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