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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'beb070152fd67ed3f63553cf07b90623c2043921466fa661f0e45fe5e9d8de3a' 
  AND token = 'V1rBE8EYASapmjUbI7XKL1vTb1WPiRD6eAaHxw5AIbw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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