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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73183da2f25e2fe94a94036c2e8b43c47d36f8324111373ffcdc2f624f2900e7' 
  AND token = 'yr29nJkbODCDSdBBk5kpVu1urKNkEamkMzETS09YJeo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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