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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87c79ad763c931660db3f417868012bb63fd0e9ca2a3c2b431c7446fb73ce6ff' 
  AND token = 'OKrkGAo6XsTcdug4JRe0ArYen53ciDfHo7S35TyRaXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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