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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '370df5d67d523c294d88c81e31e7e5b98965d4633eea86a71ddcb7c55665cd02' 
  AND token = '98hrFqtvXiU96Gp4NbZ2mXo/Onwa7AMqPb+dP1xraHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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