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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe2d20a094eac9342b81b2275aa33edba30aeae5cf7e1d05331642832bc046e2' 
  AND token = '/EMAJT0/FM54+dctQNhGw42KYtxPy+IXVMHKtpGQIS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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