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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37ef4a1bd8e162598230f3afb824ec350267747d820f78fcf2f6b3062c86d92f' 
  AND token = 'oqmmXK6p6dWJZJ11s/fEvsO5Ylirkt3mETjh2wrVeC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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