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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf86536c3376246b01b9a86786e72e296d56836a2ef02aaf99ea30149a8e100e' 
  AND token = 'YLzQeTM7YRIdjGfnfF0AA0FZk0IVwruk+oCrJZdcBmY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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