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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27ef6694edac890e618195483722c30c704d5d2bfde7a7723416c9fd66b3ffdc' 
  AND token = 'eecl4Fk9+X+iCIJGwBSzReEv3S9j648wr2aMJRWRf6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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