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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb7061321012719bd3af93428785fe47fdb65fae77a28de5fd706b897852f8ba' 
  AND token = 'LmyzbjvWJZKgDXS8M2As0h5SRbsJI07VnysnmSoxxqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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