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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20193f943efffedb6a74ca8581c6ec8492ae9a2b1fa84ebf7475f736ea5a523c' 
  AND token = 'FZl6RXnWYrW3bvU2WOaDkpihlW5v/LLHtxZpplX1KWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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