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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e44b7101780619841406c23d7d76fc834a96c0407dda4e7f2e3a03cc09985360' 
  AND token = 'BnyQid9dEB+KrX/DNf9MBW/C7T9COH3PGLAL+T/MpGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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