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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93253600d47d0468523316b61ca60714fdfea986297f61f0f8b87243c1afbf23' 
  AND token = '32fNTfaUDcKF1NJ1nu1RV9I/Xfa71skwB4Be52PXK7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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