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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0309af4e1621da739d6290229d49e0f4692e35a1f4ca8e4ad077fa5cd263496b' 
  AND token = 'ohPxgLcqkx2Fzln/627Mr1neWLRI6oY5Exxvta+4ehw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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