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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2345804da0d71087af1c1f5d2e6793196218cd5f3b071f87f340cd751b183acb' 
  AND token = 'cPlbCBitR5XDyaGWGrD35x75Va6MWQuvXnLiTY72D/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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