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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d0f97ed450f9cae4db7a093ae47e8d4b753bb295dd46f568e7628d6c5ed7640' 
  AND token = 'FprmN0w7R9lbD8TuMNoogyN9aqqviLtKG8qaM049upc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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