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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6e783efc2fe1f115aee6d5367ecffa6a78564a1e7c6d1fbf8f1bf3cab84c5d6' 
  AND token = 'I6AwFKM381iasnGY+fCIE0ZdjlQ8Gah0e8+QHDyidyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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